[anthonylevine]

I think people lump CQRS, Event Sourcing, and event-driven into this a single concept and then use those words interchangeably.

[andersmurphy]

Yup. It's a shame as amazing as event sourcing is it does come with complexity.

On the other hand CQRS + single writer pattern on their owncan be a massive performance win because it allows for efficient batching of views and updates. It's also much simpler to implement than a fullblown event sourcing system.